Photoprotective cosmetic compositions comprising inorganic UV-blocking agents

Abstract

Stable photoprotective cosmetic emulsions, notably water-in-oil emulsions well suited for the UV-photoprotection of the skin, lips, mucous membranes and/or hair, contain at least one aqueous phase, at least one oily phase, an effective UV-photoprotecting amount of at least one coated or uncoated metal oxide UV-blocking agent and an effective stabilizing amount of at least one amphiphilic oligomer or polymer derived from a polyolefin which also comprises at least one polar moiety, formulated into a physiologically acceptable medium therefor.

1. A photoprotective cosmetic emulsion comprising at least one aqueous phase, at least one oily phase, an effective UV-photoprotecting amount of at least one metal oxide UV-blocking agent and an effective stabilizing amount of at least one amphiphilic oligomer or polymer derived from a polyolefin which also comprises at least one polar moiety, formulated into a physiologically acceptable medium therefor. 
     
     
       2. The photoprotective cosmetic emulsion as defined by  claim 1 , said at least one amphiphilic oligomer or polymer derived from a polyolefin comprising a polyolefinic apolar moiety having at least 40 carbon atoms. 
     
     
       3. The photoprotective cosmetic emulsion as defined by  claim 1 , said at least one amphiphilic oligomer or polymer derived from a polyolefin comprising a polyolefinic apolar moiety having from 60 to 700 carbon atoms. 
     
     
       4. The photoprotective cosmetic emulsion as defined by  claim 2 , said polyolefinic apolar moiety comprising an oligomer, polymer and/or copolymer of ethylene, propylene, 1-butene, isobutene, 1-pentene, 2-methyl-1-butene, 3-methyl-1-butene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene or 1-octadecene. 
     
     
       5. The photoprotective cosmetic emulsion as defined by  claim 1 , said at least one oligomer or polymer derived from a polyolefin reducing the interfacial tension thereof by at least 10 mN/m when said oligomer or polymer is present at a concentration of 0.01% by weight relative to the weight of the oily phase. 
     
     
       6. The photoprotective cosmetic emulsion as defined by  claim 1 , said at least one polar moiety being anionic, cationic, nonionic, zwitterionic or amphoteric. 
     
     
       7. The photoprotective cosmetic emulsion as defined by  claim 1 , said at least one polar moiety comprising a polyalkylene glycol, polyalkyleneimine, carboxylic or dicarboxylic acid, anhydride or derivative thereof, or mixture thereof. 
     
     
       8. The photoprotective cosmetic emulsion as defined by  claim 1 , said at least one polar moiety comprising polyoxyethylene, succinic acid or anhydride or derivative thereof. 
     
     
       9. The photoprotective cosmetic emulsion as defined by  claim 1 , said at least one oligomer or polymer derived from a polyolefin comprising the reaction product between a polyolefin derivative and at least one acid selected from the group consisting of maleic acid; maleic anhydride; fumaric acid; itaconic acid; citraconic acid; mesaconic acid; aconitic acid; derivatives and mixtures thereof. 
     
     
       10. The photoprotective cosmetic emulsion as defined by  claim 1 , said at least one oligomer or polymer derived from a polyolefin comprising a polyisobutylene with an optionally modified succinic endgroup. 
     
     
       11. The photoprotective cosmetic emulsion as defined by  claim 1 , said at least one oligomer or polymer derived from a polyolefin comprising the product of the reaction of maleic anhydride with polyisobutylene. 
     
     
       12. The photoprotective cosmetic emulsion as defined by  claim 1 , the amount of said at least one oligomer or polymer derived from a polyolefin ranging from 0.1% to 20% by weight of active material relative to the total weight of the composition. 
     
     
       13. The photoprotective cosmetic emulsion as defined by  claim 1 , said at least one metal oxide comprising a titanium, zinc, iron, zirconium or cerium oxide or mixture thereof. 
     
     
       14. The photoprotective cosmetic emulsion as defined by  claim 13 , said at least one metal oxide comprising a nanopigment thereof. 
     
     
       15. The photoprotective cosmetic emulsion as defined by  claim 1 , said at least one metal oxide having been coated with one or more compounds of alumina, silica, aluminum, silicon, sodium, iron, fatty acid, fatty alcohol or derivative thereof, lecithin, wax, (meth)acrylic polymer and/or fluoro compound. 
     
     
       16. The photoprotective cosmetic emulsion as defined by  claim 1 , the amount of said at least one metal oxide ranging from 0.5% to 30% by weight of active material relative to the total weight of the composition. 
     
     
       17. The photoprotective cosmetic emulsion as defined by  claim 1 , further comprising at least one other UV-sunscreen. 
     
     
       18. The photoprotective cosmetic emulsion as defined by  claim 1 , said at least one oily phase comprising from 5% to 80% by weight relative to the total weight of the composition. 
     
     
       19. The photoprotective cosmetic emulsion as defined by  claim 1 , comprising a water-in-oil emulsion. 
     
     
       20. The photoprotective cosmetic emulsion as defined by  claim 1 , formulated as a makeup. 
     
     
       21. The photoprotective cosmetic emulsion as defined by  claim 1 , formulated as a cream or milk. 
     
     
       22. The photoprotective cosmetic emulsion as defined by  claim 1 , having a viscosity ranging from 60 to 3,000 cP. 
     
     
       23. The photoprotective cosmetic emulsion as defined by  claim 22 , having a viscosity ranging from 80 to 2,500 cP. 
     
     
       24. The photoprotective cosmetic emulsion as defined by  claim 22 , having a viscosity ranging from 60 to 600 cP. 
     
     
       25. The photoprotective cosmetic emulsion as defined by  claim 24 , having a viscosity ranging from 80 to 250 cP. 
     
     
       26. A regime or regimen for the UV-photoprotection of the skin, lips, mucous membranes and/or hair, comprising topically applying thereon a photoprotective cosmetic emulsion which comprises at least one aqueous phase, at least one oily phase, an effective UV-photoprotecting amount of at least one metal oxide UV-blocking agent and an effective stabilizing amount of at least one amphiphilic oligomer or polymer derived from a polyolefin which also comprises at least one polar moiety, formulated into a physiologically acceptable medium therefor. 
     
     
       27. A method for stabilizing a photoprotective emulsion comprising at least one UV-blocking metal oxide, which comprises formulating therein an effective stabilizing amount of at least one amphiphilic oligomer or polymer derived from a polyolefin and which also comprises at least one polar moiety.